sedimentary

River Gravel

Polymictic Gravel / Detrital Rock Aggregate

AI-generated identification · may be incorrect

Hardness varies (Mohs 6-7 generally for quartz-rich components), colors range from brown, tan, to gray, vitreous to dull luster, rounded to sub-rounded shape due to aqueous abrasion, variable crystal structure depending on constituent minerals.

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the mechanical weathering, erosion, and long-distance transport of various parent rocks by river currents, smoothing out sharp edges over thousands to millions of years in alluvial environments.

Uses & applications

Widely used in construction for concrete aggregate, road base, landscaping, drainage systems, and garden pathways.

Geological facts

River gravel beds are dynamic ecosystems and often preserve various durable mineral fragments like quartz, jasper, and quartzite that survived rigorous transport.

Field identification & locations

Found extensively in riverbeds, floodplains, and glacial outwash plains worldwide; easily identifiable by smooth, rounded surfaces resulting from water tumbling.